Anode material for lithium secondary battery, an electrode for lithium secondary battery and a lithium secondary battery

Abstract

The present invention provides anode material consisting of anode active material having a great charge-discharge capacity, a high charge-discharge efficiency, a flat discharge curve and good charge-discharge cycle properties, and provides the anode material for a lithium secondary battery consisting of being coated with an amorphous metal compound formed by a metal capable of alloying with lithium on at least one part of the surface of a carbon material capable of absorbing and releasing lithium ion.

What is claimed is:  
     
       1. An anode material for a lithium secondary battery comprising; 
       a carbon material capable of absorbing and releasing lithium, the carbon material having a surface; and  
       an outer coating of an amorphous metal compound formed on at least one part of the surface of the carbon material, the amorphous metal compound including one or more metals selected from the group consisting of Sn, Ag, Fe, Pd, Pb, Al, Si, In, Cu, Co, Zn, and Cd.  
     
     
       2. The anode material according to  claim 1 , wherein the outer coating of the amorphous metal compound is a thin film. 
     
     
       3. The anode material according to  claim 1 , wherein the metal compound is formed by heat-treating a carboxylic metal salt. 
     
     
       4. The anode material according to  claim 3 , wherein the carboxylic metal salt is tin acetate. 
     
     
       5. The anode material according to  claim 1 , wherein the metal compound comprises one or both of SnO 2  and SnO. 
     
     
       6. A negative electrode for a lithium secondary battery comprising the anode material according to  claim 1 . 
     
     
       7. A lithium secondary battery comprising a negative electrode having the anode material according to  claim 1 .